The Journal of Immunology, Vol 126, Issue 6 2310-2316, Copyright © 1981 by American Association of Immunologists

ARTICLES

Seeding of the 10-day mouse embryo thymic rudiment by lymphocyte precursors in vitro

JC Fontaine-Perus, FM Calman, C Kaplan and NM Le Douarin

The thymic rudiment was removed from the mouse embryo at 10 days of gestation, while it was still included in the 3rd branchial arch. When cultured alone, either in vitro or on the chick chorioallantoic membrane (CAM), it failed to develop as a lymphopoietic organ and remained in an epithelial state. If it was associated in transfilter culture with various types of hemopoietic organs from either embryonic or adult mice (e.g. yolk sac, fetal liver, thymus, bone marrow), it became seeded by lymphoid precursor cells and underwent a normal histogenetic process. If the donor and the receptor explants belonged to different strains of mice, the thymus that developed in culture was chimeric: thymic stroma cells (i.e., epithelial and connective cells) were of the receptor explant type, whereas the lymphoid population was of the donor type. Two genetic markers were used to label the thymic cell types, the Thy-1-1-Thy-1-2 system and the isozymes of the glucose phosphate isomerase.

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